Heel guard



FIG. 1 is a perspective view of a heel guard showing my new design;

FIG. 2 is a left side elevational view;

FIG. 3 is a front elevational view;

FIG. 4 is a top plan view;

FIG. 5 is a bottom plan view; and,

FIG. 6 is a rear elevational view. 

The ornamental design for a heel guard, as shown and described. 